Lock shackle



FIG. 1 is a top view of a lock shackle with five flat sides;

FIG. 2 is a side view of the lock shackle shown in FIG. 1, wherein each side is a mirror of the other;

FIG. 3 is a front view of the lock shackle of FIG. 1, wherein the front view and the back view are mirror images of each other; and,

FIG. 4 is a bottom view of the lock shackle of FIG. 1.

The portions of the Figures shown in phantom lines are not part of the claimed design but are for illustration only. 

The ornamental design for a lock shackle, as shown and described. 